Ophthalmoscope



.L t e e h Sk .w e e h S 2 H L Tw .OG Rw .M 0L A .H WT .m AO M d M o m Patented Oct. 31,1893.

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UNITED STATES PATENT OEECE.'

AUGUST WILHELM OTTO ROTH, OF BERLIN, GERMANY, ASSIGNOR TO EMIL B. MEYROWITZ, OF NEW YORK, N. Y.

OPHTHALMOSCOPE.

SPECIFICATION forming part of Letters Patent No. 507,934, dated October 31, 1893.

Application tiled March 24 1893. Serial No. 467,498.k `(No model.) Patented in Germany April 5, 1892, No. 66,215, and in Austria.'-lungary November 1, 1892, No. 29,187 and No. 61,474.

` To au whom, t may concern: In common with other ophthalmoscopes of Be it known thatI, AUGUST WILHELM OTTO the same class, each of the improved instru- ROTH, known as Dr. A. ROTH, a subject ofments comprises a rekosh disk A (Fig. 1 or the Emperor of Germany, and a resident of Figs. 7 to 9) attached, by an arbor-screw B,

5 Berlin,Germany,have invented anewand useto a metallic support O,atthe extremity of a 55 ful Improvement in Ophthalmoscopes, (patconvenient handle D, and in front of a rear ented to mein Germany by Letters Patent N o. mask E, which is attached to the same sup- 66,215, dated April 5, 1892, and to F. Fritsch, port and has a small hole e, Figs. 4 and 5, in Austria Hungary, by Letters Patent No. with .which a like hole f, Figs. 4, 5 and 14, in

ro 29,187 and No. 61,474, dated November l, a mirror F behind the mask, coincides when 6o 1892,) of which the following is aspecitication. the mirror is in working position; saidv disk This invention relates to those ophthalbeing provided with a series of plus lenses, moscopes which are designed for testing the marked in Figs. 1 and 7 according to their refocus of vision by means of dioptric lenses. spective diopters -l-l, +2, dac., an open hole O,

i5 The invention consists in certain novel and a series of minus lenses, marked, in Figs. 65 combinations of parts, hereinafter set forth land 7, 1, 2, &c.,all of which are arranged and claimed; and its objects are (tirst) to eX- 'in one broken circle concentric with said artend the main or revolving series ofv lenses in bor-screw B, and at the same radial distance the so-called rekosh disk by means of a therefrom as said holes e and f, so as to be suczo segment carrying the supplemental lenses, cessivelybrough'tinto line with said holes by 7o and automatically moved by coaction with rotating the disk. In addition,l the improved said disk, so that all the various exposures of rekosh disk Ais provided with means for aulenses may be made without removing the tornatically transmitting motion to a superinstrument from the eye, and (second) to inposed lever or swinging segmentG (Fig. 2 or 25 dicate the exact value of each lens or combi- Figs. 10 to 12) which is attached to said support` 75 nation of lenses by a dial and pointer so that C by apivot-screw P below the disk, and is prothe indication may be easily and correctly vided with plus and minus lenses, marked, in

read. Figs. 2 and 10, -l-13 and-13, respectively, TWO sheets-of drawings accompany this together with an open hole o between them, 3o specification as part thereof. all at the same radialdistance from said pivot- 8o Figure 1 of these drawings (Sheet 1) is a screwPas said holeseand f; such meansfor face View of an improved rekosh disk. Fig. automatically moving this segment consist- 2 is an elevation of a superposed lever or ing preferably of a spiral groove S in the segment. Fig. 3 is a face view of the corremiddle portion of the disk, in the form of 55 sponding dial and pointer, and Fig. 4 is a three concentric broken rings, a, m, i, con- 85 face view of vthe improved ophthalmoscope nected in series byHIiat S-shaped curves, and produced by uniting said disk, segment, dial a stud S2 projecting into said groove from the and pointer with other parts. Figs. 5 -to 14 back of the segment G. inclusive (Sheet 2) represent the improved The improved rekosh diskAof each instru- 4o ophthalmoscope audits principal parts as rement is further provided with a hub X for 9o modeled for the American market; Fig. 5 becarrying in front thereof and in front of the ing a face view of the instrument, Fig. 6 an segment G a dial Y (Fig. 3 or Fig. 13) proedge View of its upper portion, Figs. 7, 8 and vided with characters, descriptive of the sev- 9 face, edge and back views of the improved eral lenses and their combinations, arranged 45 rekosh disk, Figs. 10, 11 and 12 front,edge and in three circles, c? m2 i2, corresponding with 95 back views of the united segment and pointer, said rings a 'm e' of the groove S. Means are Fig. 13 a face view ofthe dial, and Fig. 14, a also provided in eachimproved instru'mentfor face View of the mirror. moving in unison with the segment a pointer Like letters and numerals refer to corre- Z (Fig. 3 or Figs. 10 and 11) to coact with 5o spending parts in all the figures. said dialY. The pointer is conveniently proroo vided with a pivot-hole P3, Figs. 3 and 10, which" coincides with the pivot-hole P2, Figs. 2 and 12, of the segment, and with a screwtapped hole in the support C, to receive said pivot-screw P, and is tixedly attached to the segment, as in Fig. 4 and Figs. 10 and 11, by another screw a, so as to be carried by the segment, and thus moved therewith.

The operation is as follows: Starting with the German instru mentin the condition represented by Fig. 4 for example, and turning the disk A to the left, the stud S2 will glide from the middle ring m ot' the groove S into its outer ring a, carrying with it the segment G so as to bring the lens +13, Fig. 2,in front of the lens +6, Fig. 1, and both in front of said holes e and f, for the lens-value +7, and shifting at once the dial Y and the pointer Z so as to indicate such face-value. Another movement of the disk A to the left brings the lens- -5 behind said lens +13, and turns the dial for the value +8; and so on, to the plus limit of the instrument, which in this example is the combination of +13 and +6, equaling +19. On turning the disk A to the right in said position, Fig. 4, the open hole o of the segment G remains opposite said holes e and f until the remainder of the plus lenses, +5 to +1, the Zero hole O, and the minus lenses, -1 to 6, have successively come behind said hole o; and the stud S then glides from the middle ring m of the groove into the inner ring t; the lens -13 Fig. 2, of the segment comes in front of the lens +6 in the disk for the lens-value -7; the dialYand pointerZ are simultaneously moved to indicate this value; and so on, until the minuslimit ofthe instrument is reached, which in the example is the combination of'-13 and -6, equaling 19. In the American instrument, Figs. 5 to 14, by providing the disk A with two additionalplus lenses and one additional minus lens, the capacity of the instrumentis made to extend from +24 to 23. The number of lenses in the disk may be larger or smaller as may be preferred; half-diopter lenses can if desired be introduced, and other like modilications will suggest themselves to those skilled in the art. In the German instrument, Fig. 1, die., the stud S2 Fig. 2 projects rigidly from the segment G, and when eitherend of the groove S is reached the motion of the diskAmust be reversed and it must be given one anda half turns to bring the instrument to zero. In the American instrument Fig. 5, dre., the stud S2 is mounted on the free end of a blade spring S3 attached to the segment, and the protruding end of the stud is beveled, as in Figs. 10v and 11, so that by continuing the motion of the disk A the stud may be sprung out of the end of the groove into the beginning of the outer ring or the inner ring as the case may be and the instrument may then be brought quickly to zero by a short reverse turn of the disk. The four holes shown in the disk A at s, in Figs. 7 and 9, facilitate forming the ends and connecting curves of the groove S so as to render them smooth. See Fig. 9. Aspring detent T, Fig. 6, engaging with indentations t, Fig. 9, in the back of the disk A, is preferably added to facilitate stopping the disk with the lenses in alignment with the holes e and f.

The mirror F may be of any preferred kind. In the German instrument a circular mirror, F Fig. 4, is attached by a spring hinge (not shown) at its lower edge. In the American instrument a tilting mirror, F, Figs. 5, 6 and 14, is attached by a pair of pivots, and is provided with a pair of downwardly projecting studs, f2 Fig. 14, by which to readily shift it.

Having thus described the said Ophthalmoscopes, I claim as my invention and desire to patent under this specilicationl. The combination, in an ophthalmoscope, ol a lens-carrying disk, a segment provided with supplemental lenses, and means substantially as described for transmitting motion from said disk to said segment as the disk is turned, whereby said segment is automaticallyshifted to combine the lenses.

2. The combination, in an ophthalmoscope, of a lens-carrying disk, a segment provided with supplemental lenses, adial which rotates with said disk, a pointer movable with said segment, and meanssubstantially as described for transmitting motion from said disk to said segment and pointer as the disk is turned, whereby the lenses are combined automatically, and their value is indicated by said pointer.

3. An ophthalmoscope which comprises a lens-carrying disk provided with a groove in the form of three broken rings concentric with the arbor of the disk and connect-ed with each other in series, a segment having plus and minus supplemental lenses with an open hole between them, and'provided with a stud which follows said groove, a dial turning with said disk and having lens-value characters thereon in three concentric circles corresponding with the rings of said groove, and a pointer moving with said segment and coacting with said dial, substantially as hereinbefore specified.

AUGUST WILHELM OTT() RO'III.

1vVitn esses:

GEoRc HEUERMANN, F. DUs.

IOO 

